Self-setting slip for rotary tables



c. B. REYNOLDS SELF SETTING SLIP FOR ROTARY TABLES Filed July '7. 1921 INVENTOR. 5.

ATTORNEY?- Patented Sept. 2, 1924.

owns 3. moans, or wnrr'rrnn, cumonnm.

SELF-SETTING SLIP FOR ROTARY TABLES.

Application filed m 7, 1921. Serial No. 482,960.

To all whom it may concern:

Be it known that 1, CHARLES B. Rmmoms, a citizen of the United States, residing at Whittier, in the county of Los Angeles and State of California, have invented new and useful Improvements in SelfSetting Slips for Rotary Tables, of which the following i is a specification.

My invention relates generally to rotary *drill tables, and more particularly to drill rod engaging slips and bushings; the principal objects ofmy invention being to generally improve. upon and simplify the construction of the existing forms of rotary drill tables, to provide simple andefiicient means for'causing the slips to positively engage the drill rod and to lock said slips in their rod. engaging positions, to provide simple and efficient means for effectively locking the slip carrying bushings in the drill table so that it will be impossible for said bushings to be accidentally elevated from their proper operative positions on the drill table until the locking means is disengaged, and, further, to provide a construction that may be readily assembled or taken apart, and which may be easily and cheaply produced.

With the foregoing and other objects in view, my invention consists in certain novel features of construction and arrangement of parts that will be hereinafter more fully described and claimed, and illustrated in the accompanying drawings, in which:

Fig. 1 is a top plan view of a rotary drill table of my improved construction.

Fig. 2 is a vertical section taken onthe line 2-2 of Fig. 1.

Fig. 3 is across section taken on the line 33 of Fig. 1. r

Fig. is a horizontal section taken on the line 4-4 of Fig. 3. I

Figure 5 is a sectional perspective view of the actuating means for one of the slips.

J ournaled in a suitable bearing on base 10. i

is a power driven shaft 15, and fixed thereon is a pinion 16 that meshes with the teeth 14 on drill table 13, thereby providing means for rotating the latter.

Formed in the center of the table 13 is a substantially rectangular opening 17, and, positioned in said opening and supported by flanges 18 that project inwardly from the body of table 13 and at the lower portion of said opening, is a pair of bushings 1.9.

Formed on the table 13 immediately adjacent to the sides of opening 17, are horizontally disposed pockets 20, the tops of which are closed by cover plates 21, and,

arranged, to revolve freely within each pocket 20, is a segmental plate 22 from the axis of which projects upwardly a circular lug 23, and formed in the latter is an angular recess 24 that is adapted to receive a socket wrench.

Lug cans arranged for rotation in at suitable dpfning in cover plate 21.

Formed in the ends of the bushings 19,

immediately adjacent to their inner meet-- ing faces, and recesses 25 that occupy thesame plane w1th the pockets 20 and said recesses being adapted to receive the outer portions of the segmental plates 22 when the same are turned-inwardly toward said bushings.

The construction just described provides simple and efiicient means for very securely locking the bushings in the drill table and prevent said bushin s from bein elevated or pulled upwardly romsaid tab e as a result of friction between the slips and the drill rod during the upward movement of the latter.

Formed in the inner faceof each bushing is a vertically disposed semicircular recess,

and the recesses in the two bushings co-operate to form a substantially circular chamber 26 in which is positioneda pair of vertically disposed semicylindrical plugs 27 that perform the functions of slips, in that they firmly grip the drill rod or tube R and transmit rotary motion thereto as the drill table and parts associated therewith are rotated.

The diameter of the combined slips 27 is slightl less than the diameter of chamber 26, an thus the slips are permitted to move for limited distances toward' and away from each other.

Formed on the inner faces of said slips are vertically disposed semicircular grooves 28 that are preferably corrugated, or provided with small teeth, in order that the sli s may firmly grip the drill rod or tube.

ecured to the outer portion of each slip 27 is a short horizontally disposed rack bar 29, the same extending through a suitably located 0 ening in the. corresponding bushing 19, and, engaging the teeth of each rack bar, are the teeth of a small pinion 30 that is carried by a vertically disposed shaft or stem 31, which latter extends upwardly through the corresponding bushing and is provided on its upper end with a head 32 in which is formed an angular recess that is aldapted to receive a socket wrench or like too The construction just described provides simple and efficient means for moving the slips 27 toward each other and into clamping engagement with the drill rod or tube; and thus, as the table 13 is rotated, such rotary motion will be transmitted directly to the drill rod or tube through the bushings 19 and the slips 27 that are carried by said v bushings.

By applying a socket wrench or the like to the heads on the upper ends of shafts 31 and rotating the latter, the slips may be drawn away from the drill rod ortube, and, when it is desired to remove the bushings from the drill table, the segments 22 are rotated so that all parts thereof are moved out of the recesses 25 in the ends of said bushings, and with the parts so positioned, said bushings may be lifted from the open- 17 in the drill table.

in In some instances it may be found advantageous to locate locking members such as 22 in suitably located recesses in the bushings 19 and which locking members engage in recesses formed in the slips 27 or in squares that engage the drill rod or tube while the same is performing drilling operations. In this connection it will be understoodthat the squares and the slips are adapted to be interchangeably arranged in the bushings.

By my improved arrangement of bushings, the height of the drill table may be kept within a comparatively low limit with respect to the top of the base 10; in other words the height of said table is such as to not interfere with the free movements of the operators when the drill rod is being elevated or lowered.

Thus it will be seen that I have provided a relatively simple and practical drill table, of strong and substantial structure, and said table being provided with meansfor effectually locking the bushings to the table and said bushings being provided with improved drill rod engaging slips actuating devices therefor.

in shown and described without departing from the spirit of my invention, the scope of which is set forth in the appended claims.

I claim as my invention:

1. The combination with a rotary drill table, of a pair of bushings removably positioned therein, means ,for locking said bushings to said table, and drill rod engaging slips adjustable horizontally in said bushings.

2. The combination with a rotary drill table, of a two-part bushing arranged in said table, means for locking both parts of said bushing to said table, and horizontally adjustable means disposed between the arts of said bushing for engaging a drill roll.

3. A rotary drill table having a bushing, slips movable in a single plane which is transverse of the bushing, and means formoving the slips 'in either direction whereby they are adapted to grip or release a drill rod extending through the bushing.

4. In combination, a rotary table, a twopart bushing in the table having recesses therein, slips movable transversely into and out of the recesses, and rotatable means carried by the table which. is capable of projecting the slips into or Withdrawing them from said recesses.

5. The combination with a rotary drill table, of a pair of bushings arranged therein, the ends of said bushings being provided with recesses, locking members arranged for operation on the table and adapted to be moved into the recesses in said bushings, drill rod engaging slips supported by said bushings, and gear operated means for moving said slips into engagement with a drill ro 6. The combination with a rotary drill table, of a two-part member arranged therein, the ends of said members being provided with recesses, and locking members arranged for swinging movement within recesses in said table for engaging the recesses in said two-part member.

7. In combination, a rotary drill table, a two-part bushing arranged in the table, slips within the bushing and movable horizon tally therein to occupy gripping or non-- gripping position with respect to a drill rod, and means for moving the slips to either of said positions.

8. In combination, a rotary drill table, a two t bushing arranged in the table, slips within the bushing and movable horizontally therein to occupy gripping or non-gripping position with respect to a. dull rod, and means for moving the sli to either of said 6 positions, comprising rach bars fixed to the slips and movable thro pinions 'ournaled in the bushing and engaging t e rack bars.

9. In combination, a rotary drill table 10 having pockets formed therein, a two-part bushing arranged in the table between the pockets and having recesses formed there- 1n, and members rotatably-mounted in said ockets to be projected into or withdrawn 1!! rom said recesses for the purpose described.

10. In combination, a rotary drill table having pockets formed therein, a two-part bushing arranged in the table between the 10 pockets and having recesses formed thereugh the bushing, and

in in spanning relation to the parts of the bushing, and members .rotatably mounted in the pockets to engage within the recesses for securing both parts of said bushing against upward displacement from the table.

11. In combination, a rotary drill table, a two-part bushing arranged in the table, means for locking bothparts of the bushing to the table, slips horizontally adjustable within the bushing, rack bars carried bv'the slips and movable through the bushing, pinions meshing with the rack bars, stems formed on the pinions and extending to the upper end of the bushing, and heads formed on the stem adapted to be engaged by a tool for rotating the stems and pinions.

In testimony whereof. I have signed my name to this specification.

CHARLES B. REYNOLDS. 

